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    40Ar/39Ar ages and geological significance of Neoproterozoic–Cambrian mafic rocks in the Aksu–Wushi area, NW Tarim Craton

    Access Status
    Fulltext not available
    Authors
    Lu, Y.
    Zhu, W.
    Jourdan, Fred
    Ge, Rongfeng
    Cui, X.
    Wen, B.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Lu, Y. and Zhu, W. and Jourdan, F. and Ge, R. and Cui, X. and Wen, B. 2018. 40Ar/39Ar ages and geological significance of Neoproterozoic–Cambrian mafic rocks in the Aksu–Wushi area, NW Tarim Craton. Geological Journal.
    Source Title
    Geological Journal
    DOI
    10.1002/gj.3375
    ISSN
    0072-1050
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/73949
    Collection
    • Curtin Research Publications
    Abstract

    Mafic dyke swarms and continental flood basalts record crucial information on mantle dynamics, crustal palaeostress, and supercontinent cycle. However, these mafic rocks are relatively difficult to date using zircon U–Pb methods because autogenous magmatic zircons are rare or absent in the rapidly cooled mafic magmas and most zircons extracted from these rocks are likely captured from their wall rocks. One good example of this dilemma is the Precambrian mafic dykes and layered basites in the Aksu–Wushi area, NW Tarim Craton, from which abundant zircon U–Pb data have yielded age spectra similar to those of the detrital zircons from the associated (meta-)sedimentary rocks. In this paper, we performed the first 40Ar/39Ar dating on separated mineral grains from the mafic dykes (plagioclase and amphibole) and layered basites (plagioclase and pyroxene) in this area. Amphiboles from a mafic dyke cross-cutting the blueschist-bearing Aksu Group yielded a 40Ar/39Ar plateau age of 744.5 ± 2.8 Ma, whereas pyroxenes from a layered basite within the Sugetbrak Formation yielded a 40Ar/39Ar plateau age of 521.0 ± 2.1 Ma. The 40Ar/39Ar plateau age of 744.5 ± 2.8 was interpreted as the crystallization age of the studied mafic dykes and provides a minimum constraint for the third phase of deformation of the blueschist terrane. The mini-plateau age of 521.0 ± 2.1 Ma was interpreted as a minimum crystallization age for basite of the Sugetbrak Formation. We also conducted geochemical analyses on layered basites of the Sugetbrak Formation from the Xiaoenbrak Formation, and the results indicated that these layered basites shared a uniform geochemical characteristic. Combining geochronological and geochemical analyses, we propose that the basites of the Sugetbrak Formation probably recorded a rifting event on the north-western margin of the Tarim Craton during Early Cambrian.

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